Question # 1

According to the law of conservation of linear momentum, the total linear momentum of an isolated system

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increases

decreases with time

remains constant

none of them

When a body is vibrating, the displacement from mean position:

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Increases with time

Decreases with time

Changes with time

None of these

Light has:

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Wave nature

Particle nature

Dual nature

None of these

A body is thrown from a height h with speed u, it hits the ground with speed V

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The value of V is maximum if the body is thrown vertically downward

The value of V is maximum if the body is thrown vertically upwards

The value of V is minimum if the body is thrown horizontally

The value of V does not depend on the direction of which it is thrown

Neutron was discovered in

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1915

1920

1925

1932

The wave form of alternating voltage is the graph between:

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Voltage across X-axis and time across y-axis

Current and time

Voltage along y-axis and time along x-axis

Voltage and current

Either (B) or (D)

Significant figures in 0.0010 are

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Four

Three

Two

One

The SI unit of charge is

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Ampere

Watt

Coulomb

Volt

Joule

In Pakistan electricity is supplied for domestic use at 220 V, it is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in Pakistan is R, the resistance of a 60 W bulb for use in USA will be

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2 R

R/4

R/2

R

In transverse waves, the individual particles of the medium move:

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In circles

Perpendicular to the direction of level

Parallel to the direction of level

None of these

The A.M. transmission frequency range from

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500-1000 KHz

540-1600 KHz

300-490 KHz

900-2040 KHz

Position was discovered by Carl Anderson in

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1920

1925

1928

1932

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

none of these

The density of blood is nearly equal to that of

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mercury

sodium

water

honey

A diatomic gas molecule has

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translational energy

rotaional energy

vibrational energy

all of them

Cosine of an angle is positive in:

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2nd quadrant

3rd quadrant

4th quadrant

All of these

In photoelectric effect the energy of ejected electrons depend on

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The frequency

The intensity

Both frequency and intensity

None of these

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

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3525.0 volts

35.35 volts

353.5 volts

3.535 volts

The electrons in the outermost shell of an atom are called

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core electrons

valence electrons

high energy electrons

none of them

Different radioactive material have

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same half lives

different half lives

same mean lives

same total lives

Gaussian surface is always:

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Rectangular

Spherical

Cylinder

Box shape

Any of these

The capacitance of a parallel plate capacitor depends upon

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Area of the plates

Separation between the plates

Medium between the plates

All of the above

Motional emf is called motional:

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Electromagnetic force and is measured in newtons

Electromotive force and is measured in volt

Electromotive force and is measured in newtons

Electromagnetic force and is measured in volts

None of these

The waves which propagate through the oscillations of material particles are known as:

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Mechanical waves

Electromagnetic waves

Any of them

None of them

Plan of a coil makes an angle of 20º with the lines of magnetic field. The angle between B and vector area of plane of coil is:

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Also 20º

70º

90º

180º

None of these

Second's pendulum is the pendulum whose time period is:

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1 second

2 second

3 second

None of these

Amplitude in SHM is equivalent to ______ in circular motion

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Diameter

Radius

Circumference

None of these

Crystal of germanium or silicon in its pure form at absolute zero acts as:

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A conductor

A semiconductor

an insulator

Both (A) and (C)

Both (A) and (B)

The vector in space has:

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One component

Two components

Three components

None of these

The space around the earth within which it expects a force of attraction on other bodies is known as:

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Nuclear field

Conservative field

Electric field

Gravitational field

The value of output resistance of OP-AMOP is of the order of

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few ohms

few hundred ohms

several kilo ohms

several mega ohms

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